US7150812B2 - Method for continuous particle separation using obstacle arrays asymmetrically aligned to fields - Google Patents

Method for continuous particle separation using obstacle arrays asymmetrically aligned to fields Download PDF

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US7150812B2
US7150812B2 US10/693,091 US69309103A US7150812B2 US 7150812 B2 US7150812 B2 US 7150812B2 US 69309103 A US69309103 A US 69309103A US 7150812 B2 US7150812 B2 US 7150812B2
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particles
field
array
size
obstacles
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US20040144651A1 (en
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Lotien Richard Huang
James Christopher Sturm
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Princeton University
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Assigned to TRUSTEES OF PRINCETON UNIVERSITY, THE reassignment TRUSTEES OF PRINCETON UNIVERSITY, THE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AUSTIN, ROBERT HAMILTON
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/416—Systems
    • G01N27/447—Systems using electrophoresis
    • G01N27/44704—Details; Accessories
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/416—Systems
    • G01N27/447—Systems using electrophoresis
    • G01N27/44756—Apparatus specially adapted therefor
    • G01N27/44773—Multi-stage electrophoresis, e.g. two-dimensional electrophoresis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/416—Systems
    • G01N27/447—Systems using electrophoresis
    • G01N27/44756—Apparatus specially adapted therefor
    • G01N27/44791—Microapparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
    • B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
    • B01L3/5027—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/0005—Field flow fractionation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02—Column chromatography
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02—Column chromatography
    • G01N30/60—Construction of the column
    • G01N30/6095—Micromachined or nanomachined, e.g. micro- or nanosize

Definitions

  • the present invention relates to methods and devices for separating particles according to size. More specifically, the present invention relates to a microfluidic method and device for the separation of particles according to size.
  • Gel electrophoresis utilizes an electric field to drive charged molecules to be separated through a gel medium, which serves as a sieving matrix.
  • the molecules are initially loaded at one end of a gel matrix, and are separated into component zones as they migrate through the gel.
  • Field-flow fractionation is carried out in a thin ribbon-like channel, in which the flow profile is parabolic. Particles are loaded as a sample zone, and then flow through the channel.
  • Separation occurs as particles of different properties flow in different positions of the flow, due to the influence of a field, resulting in different migration speeds.
  • the field is applied perpendicular to the flow.
  • Sedimentation utilizes gravitational or centrifugal acceleration to force particles through a fluid. Particles migrate through the fluid at different speeds, depending on their sizes and densities, and thus are separated.
  • Size exclusion chromatography utilizes a tube packed with porous beads, through which sample molecules are washed. Molecules smaller than the pores can enter the beads, which lengthens their migration path, whereas those larger than the pores can only flow between the beads. In this way smaller molecules are on average retained longer and thus become separated from larger molecules.
  • Zones broaden, however, as they pass through the column, because there are many possible migration paths for each molecule and each path has a different length, and consequently a different retention time.
  • This multipath zone broadening (Eddy diffusion) is a major factor limiting resolution.
  • J. C. Giddings Unified Separation Science (John Wiley & Sons, New York, 1991).
  • Other methods for separation according to size, including gel electrophoresis, field-flow fractionation also involve stochastic processes, which may limit their resolution.
  • J. C. Giddings Nature 184, 357 (1959); J. C. Giddings, Science 260, 1456 (1993).
  • a substrate having a shallow receptacle located on a side thereof is provided, and an array of obstacles outstanding from the floor of the receptacles is provided to interact with the microstructures and retard the migration thereof.
  • electrodes for generating electric fields in the fluid are made on two sides of the receptacle. This is analogous to the conventional gel electrophoresis. However, micromachined structures are substituted for gel as sieving matrices.
  • arrays of obstacles sort DNA molecules according to their diffusion coefficients using an applied electric field [Chou, C. F. et. al., Proc. Natl. Acad. Sci. 96, 13762 (1999).].
  • the electric field propels the molecules directly through the gaps between obstacles, wherein each gap is directly below another gap.
  • the obstacles are shaped so that diffusion is biased in one direction as DNA flows through the array. After flowing through many rows of obstacles, DNA with different diffusion coefficients are deflected to different positions.
  • the diffusion coefficient is low for large molecules, the asymmetric obstacle arrays are slow, with running times of typically more than 2 hours.
  • entropic traps consisting of a series of many narrow constrictions ( ⁇ 100 nm) separated by wider and deeper regions (a few microns), reduce the separation time to about 30 minutes [Han, J. & Craighead, H. G., Science 288, 1026 (2000).]. Because the constrictions are fabricated to be narrower than the radius of gyration of DNA molecules to be separated, they act as entropic barriers. The probability of a molecule overcoming the entropic barrier is dependent on molecular weight, and thus DNA molecules migrate in the entropic trap array with different mobilities. Larger molecules, with more degrees of configurational freedom, migrate faster in these devices.
  • a hexagonal array of posts acts as the sieving matrix in pulsed-field electrophoresis for separation of DNA molecules in the 100 kb range [Huang, L. R., Tegenfeldt, J. O., Kraeft, J. J., Sturm, J. C., Austin, R. H. and Cox, E. C., Nat Biotechnol. 20, 1048 (2002).].
  • these devices generally require features sizes comparable to or smaller than the molecules being fractionated.
  • the need for small feature size may have the following detrimental effects: (i) the devices cannot fractionate small molecules such as proteins, (ii) the devices may have very low throughput, and thus are not useful sample preparation tools, (iii) the devices can only analyze very small volume of samples, and therefore usually require concentrated samples or expensive equipment for sample detection, and (iv) manufacturing the devices require state-of-the-art fabrication techniques, and thus high cost.
  • the present invention provides a microfluidic device for separating particles according to size comprising a microfluidic channel, and an array comprising a network of gaps within the microfluidic channel.
  • the device employs a field that propels the particles being separated through the microfluidic channel.
  • the individual field flux exiting a gap is divided unequally into a major flux component and a minor flux component into subsequent gaps in the array, such that the average direction of the major flux components is not parallel to the average direction of the field.
  • the present invention provides a microfluidic device for separating particles according to size comprising a microfluidic channel, and an ordered array of obstacles within the microfluidic channel.
  • the ordered array of obstacles is asymmetric with respect to the average direction of the applied field.
  • the device employs a field that propels the particles being separated through the microfluidic channel.
  • the present invention also provides a method for separating particles comprising introducing the particles to be separated into an array comprising a network of gaps within the microfluidic channel and applying a field to the particles to propel the particles through the array.
  • a field flux from the gaps is divided unequally into a major flux component and a minor flux component into subsequent gaps in the array, such that the average direction of the major flux components is not parallel to the average direction of the field.
  • the present invention also provides a method for separating particles according to size comprising: introducing the particles to be separated into a microfluidic channel comprising an ordered array of obstacles, and applying a field to the particles, wherein the ordered array of obstacles is asymmetric with respect to the average direction of the applied field.
  • the present invention provides a microfluidic device for separating particles according to size comprising a microfluidic channel, and multiple arrays in series within the microfluidic channel, wherein each array has a different critical size.
  • the device employs a field that propels the particles being separated through the microfluidic channel.
  • Each of the arrays comprise a network of gaps wherein a flux of the field from the gaps is divided unequally into a major flux component and a minor flux component into subsequent gaps in the network.
  • the average direction of the major flux components in each array is not parallel to the average direction of the field.
  • FIG. 1 shows a schematic diagram of an array device according to an embodiment of the present invention.
  • the device consists of an obstacle array asymmetric about the field direction.
  • FIG. 2 shows a schematic diagram of a perspective view of a preferred embodiment of the invention, comprising a base substrate with a main surface, on which an obstacle course is made to form a network of gaps, wherein cascades of unequal bifurcations of field flux occur.
  • the obstacle course may be sealed to a cap layer to form an enclosed network of gaps.
  • FIG. 3 shows a schematic diagram of an obstacle array.
  • the obstacle array is symmetric about the dotted lines (principle axis), but asymmetric with respect to the field direction.
  • FIG. 4 shows a schematic diagram of an embodiment of the invention, comprising a network of gaps defined by an array of obstacles.
  • Each streamline represents an equal amount of field flux.
  • the field flux from one gap is divided into two subsequent gaps, wherein the amounts of flux going into the two gaps are unequal.
  • two streamlines goes to the left (major flux component) and one streamline goes to the right (minor flux component) at each gap.
  • the array direction is indicated by the gray arrow.
  • FIG. 5 shows a schematic diagram of particles separated in an array device according to an embodiment of the present invention.
  • the small particles move along field and large ones towards array direction.
  • FIG. 6 shows a schematic diagram of an obstacle array, showing characteristic array dimensions.
  • ⁇ denotes the period of a row of obstacles, d the gap spacing between obstacles, and a ⁇ the lateral shift of every row.
  • FIG. 7 shows a schematic diagram of a particular array, showing that field lines go around obstacles.
  • the dotted line at the center marks the division of field lines going to different sides of the obstacle.
  • FIG. 8 shows a schematic diagram of a particular array illustrating that field lines shift relative positions in gaps.
  • a 1 ⁇ 3 and each gap is divided into three slots, which are denoted 1 , 2 and 3 .
  • Field lines passing through slot 1 go to slot 2 in the next gap, those through slot 2 go to 3 , and the ones through 3 to 1 .
  • FIG. 9 shows a schematic diagram of a particular array illustrating the path of small particles.
  • FIG. 10 shows a schematic diagram of a particular array illustrating the displacement of large particles by obstacles.
  • FIG. 11 shows a schematic diagram of a particular array illustrating the path of large particles.
  • Large particles move along the array direction (displacement mode). Note that even if the particle starts at the left side of the gap, eventually it moves to the right side and stays at the right as it is constantly being displaced by obstacles.
  • FIG. 12 shows a plot of particle migration direction vs. their size. There exists a critical particle size R 0 where a sharp transition of migration direction occurs.
  • FIG. 13 shows a schematic diagram of two arrays of different critical sizes in series. Particles at output 1 are smaller than R 1 , the critical size of the first array in the series, those at output 2 between size R 1 and R 2 , and the ones at output 3 are larger than R 2 , the critical size of the second array.
  • FIG. 14 shows a schematic diagram of multiple arrays in series, wherein each array has a different critical size.
  • the dotted horizontal line represents the division between subsequent arrays and each subsequent array in the series has a increasing critical size.
  • a continuous distribution of molecular sizes can thus be fractionated and analyzed with one device.
  • FIG. 15 shows a schematic top view of an embodiment of the invention, using a square array of circular obstacles to form the network of gaps, tilted at a small angle ⁇ with respect to the field.
  • the square array is spanned by primitive vectors x and y, which are perpendicular to each other. Bifurcation of field flux occurs because of the asymmetry of the obstacle array with respect to the field.
  • FIG. 16 shows a schematic top view of an embodiment of the invention.
  • Each obstacle is centered at a lattice point, spanned by the primitive vectors x and y.
  • the obstacles may have different shapes.
  • FIG. 17 shows a schematic top view of an embodiment of the invention. Every obstacle may be identical with the same horizontal period ⁇ . However, every row of obstacles is shifted horizontally by a different amount with respect to the previous row, and the obstacle course is not a periodic lattice.
  • FIG. 18 shows a schematic diagram of a microfluidic device for continuous-flow separation, with sample loading structures.
  • FIG. 19 shows a diagram of a microfluidic device for continuous-flow separation as constructed in Example 1.
  • FIG. 20 shows fluorescent images of microspheres migrating in the obstacle array, showing (A) the two transport modes for (B) the separation of microspheres with no dispersion.
  • the gray dots in (A), which represent the obstacles, have been superimposed on the fluorescent image.
  • FIG. 21 shows the fluorescent profiles of microspheres separated using flow speeds of ⁇ 40 ⁇ m/s (upper curves) and ⁇ 400 ⁇ m/s (lower curves) scanned at ⁇ 11 mm from the injection point.
  • the 0.60 ⁇ m, 0.80 ⁇ m, and 1.03 ⁇ m diameter beads are green-fluorescent, while 0.70 ⁇ m and 0.90 ⁇ m are red, and thus each scan is shown as two curves representing the two colors.
  • FIG. 22 shows the measured migration angles as a function of microsphere diameter at two different flow speeds.
  • FIG. 23 shows a schematic diagram of a device for particle separation comprising an array having 9 sections (divided by dotted lines) of different critical sizes, and sample loading structures. While the orientation and the lattice constants of the array are kept the same, the obstacle diameters are changed to create different-sized gaps d and critical sizes.
  • FIG. 25 shows the fluorescent profile of the separated particles scanned at 14 mm from the injection point.
  • FIG. 26 shows of fluorescent image of DNA molecules separated according to size using a device of the present invention. Molecules are introduced at the top of the figure.
  • FIG. 27 shows a schematic diagram of a device used to concentrate sample.
  • the field direction can be defined by the sidewalls of the array.
  • the shaded area shows the trajectories of particles larger than the critical size, injected from the top. Particles move against the sidewall and are concentrated.
  • FIG. 28 shows a schematic diagram of a device for concentrating particles.
  • the device comprises an array, which moves particles against a boundary of the array, and microfluidic channels and reservoirs for sample loading and collection.
  • FIG. 29 shows of fluorescent image of DNA molecules getting concentrated against a boundary of the array. DNA samples were introduced from the top of the picture.
  • FIG. 30 shows a schematic diagram of a device having an ordered array of obstacles and employing a non-uniform field, wherein the direction of the field changes across the array.
  • FIG. 31 shows a schematic diagram of a device having an ordered array of obstacles in a curved microfluidic channel.
  • the curved channel may result in a field that is non-uniform.
  • microfluidic refers to a system or device having one or more fluidic channels, conduits or chambers that are generally fabricated at the millimeter to nanometer scale, e.g., typically having at least one cross-sectional dimension in the range of from about 10 nm to about 1 mm.
  • the present invention provides a microfluidic device that separates particles in fluid according to size.
  • a field is applied to the particles being separated as the particles pass through the array.
  • the term “field” as used herein refers to any force or vector entity that can be used to propel the particles through the array.
  • the field that drives the particles being separated may be a force field, such as an electric field, a centrifugal field, or a gravitational field.
  • the field that drives the particles being separated may also be a fluid flow, such as a pressure-driven fluid flow, an electro-osmotic flow, capillary action, etc., wherein the vector entity is the fluid flux density.
  • the field may be a combination of a force field and a fluid flow, such as an electro-kinetic flow, which is a combination of the electric field and the electro-osmotic flow.
  • a fluid flow such as an electro-kinetic flow, which is a combination of the electric field and the electro-osmotic flow.
  • the average direction of the field will be parallel to the walls of the channel that contains the array.
  • gap refers to a structure wherein fluids or particles may flow.
  • a gap may be a capillary, a space between two obstacles wherein fluids may flow, a hydrophilic pattern on an otherwise hydrophobic surface wherein aqueous fluids are confined, etc.
  • the network of gaps is defined by an array of obstacles. In this embodiment, the gaps would be the space between adjacent obstacles. In a preferred embodiment, the network of gaps will be constructed with an array of obstacles on surface of a substrate ( FIG. 2 ).
  • an obstacle refers to a physical structure or pattern wherein the particles being separated cannot penetrate, and thus an obstacle may refer to a post outstanding on a base substrate, a hydrophobic barrier for aqueous fluids, etc.
  • the obstacle may be permeable to the field.
  • an obstacle may be a post made of porous material, wherein the pores allows penetration of the field, but are too small for the particles being separated to enter.
  • an ordered array is tilted at an offset angle ⁇ with respect to the field (for example, FIG. 15 ), wherein the offset angle ⁇ is selected such that the array is not aligned to the field (i.e., is asymmetric to the field).
  • an asymmetric array may also be achieved using an array comprising rows of obstacles in which each row is laterally shifted from the previous row and the misalignment factor, a, is larger than 0 and smaller than 0.5 ( FIG. 6 ).
  • the array of obstacles will be an ordered array in which a principle axis of the array is not parallel to the direction of the field ( FIG. 3 ).
  • the term “ordered” refers to an array having a generally periodic or repeating spatial arrangement.
  • the repeating spatial arrangement may be square, rectangular, hexagonal, oblique, etc.
  • the array need not be an ordered array.
  • each row of obstacles is shifted horizontally with respect to the previous row by a ⁇ , where ⁇ is the center-to-center distance between the obstacles.
  • ⁇ is the center-to-center distance between the obstacles.
  • the obstacle array is asymmetrically aligned to the field, i.e., the obstacle lattice is asymmetric with respect to the average field direction
  • field lines going through one gap have to go around the obstacle in the next row ( FIG. 7 ).
  • the field in the gap between obstacles is locally uniform, i.e. field lines are equally spaced in every gap. This may be a good approximation if the field is electrical. This assumption may be relaxed in the case of other fields.
  • the total field flux ⁇ going through one gap is divided by the subsequent obstacle and splits into two streams, the major flux component and the minor flux component, as the flux goes into the two subsequent gaps ( FIG. 7 ).
  • each field line shifts to the next slot as it passes through a row in a cyclic manner: field lines going through position 1 will be at position 2 in the next row, those at position 2 will go to position 3 . . . the ones at position 1/a will go back to position 1 .
  • Small particles follow the field and shift from one position to the next in a cyclic manner ( FIG. 9 ). Because small particles may go back to their original slot (relative position in the gap) after 1/a rows, their trajectories follow the field direction and do not disperse after going around many obstacles. Because of the “zigzag” motion of the small particles, this transport pattern may be referred to as the “zigzag mode.”
  • R 0 there exists a critical particle radius R 0 above which particles move in the array direction (displacement mode), and smaller than which particles follow the average field direction (zigzag mode) ( FIG. 12 ).
  • a particle's hydrodynamic radius (size) determines which transport mode it follows.
  • the above theory can be easily generalized for other fields, such as electrophoretic fields or pressure driven fluid flows by considering ion flows instead of fluid flows.
  • the device may be employed as a filter.
  • filter refers to a device which removes particles in certain size ranges from a fluid. The sharp transition of migration angle with respect to size is ideal for filters ( FIG. 12 ).
  • the micro/nano-structures of the arrays are preferably made by micro/nano-fabrication techniques.
  • FIG. 13 shows the schematic diagram of a filter of the invention, wherein injected particles are separated into three groups of different sizes. In principle, one array can set up one critical radius (size) for particle separation, and separate a mixture of particles into two groups of particles, in one of which particles are larger than the critical size, and in the other of which particles are smaller.
  • Two arrays of different critical sizes put together in series can separate a mixture of particles into three size ranges, large, medium, and small ( FIG. 13 ).
  • the sample of particles of different sizes is injected in the first array, which has a smaller critical size (R 1 ) than the second (R 2 ). While the large and medium-sized particles move in the displacement mode in the first array, the small ones move in the zigzag mode and are separated out. As particles move into the second array, the medium-sized particles switch to the zigzag mode and are separated out from the large ones.
  • One can collect molecules of different sizes at the output of the second array, which may serve as a molecular filter and a sample preparation tool.
  • the size range of particles going to output 2 can be very narrow.
  • the device can be designed to single out only one size of DNA restriction fragments from tens or hundreds of other sizes of fragments. This device could replace the conventional techniques of gel electrophoresis and gel cutting.
  • the device of the invention may fractionate molecules according to size.
  • High selectivity can be achieved at the sharp transition region ( FIG. 12 ), using a single array of fixed critical radius (size).
  • separation of particles in a broad size-range may require lower selectivity, which could be achieved using many arrays in series, each of which has a different critical size ( FIG. 14 ).
  • FIG. 14 shows a schematic diagram of multiple arrays in series, wherein each array has a different critical size. The dotted horizontal line represents the division between subsequent arrays and each subsequent array in the series has a increasing critical size. A continuous distribution of molecular sizes can thus be fractionated and analyzed with one device.
  • smooth migration-angle-to-particle-size characteristics can be designed using many arrays in series, each having a different critical size.
  • the critical size of a array may be adjusted by changing the gap width d, by shifting obstacles, or both.
  • the device may comprise an ordered array of obstacles and may employ a non-uniform field, wherein the direction of the field changes across the array ( FIG. 30 ).
  • the changing field directions may be created by a curved microfluidic channel. Since the critical size of the array depends on the field direction, the non-uniform field creates sections of array of different critical sizes. This may be desired for fractionation of particles in a broad size range. In the particular embodiment shown in FIG. 30 , the field direction is large at the first array section and then reduced at the following array sections, creating a large critical size in the first section and smaller critical sizes at the following sections.
  • the device comprises an ordered square array of obstacles in a curved microfluidic channel ( FIG. 31 ).
  • the curved channel may result in a field that is non-uniform.
  • the change in the field direction across the array creates a gradient of critical size in the array, because the critical size may depend on the field direction.
  • the field strength another parameter that can be tuned, may be adjusted by changing the width of the microfluidic channel.
  • This device may have better separation range and resolution than an array of one fixed critical size.
  • a continuous gradient of critical size across the array can also be created by changing gap widths.
  • the array comprises a square lattice of cylindrical obstacles, with the array tilted at an offset angle ⁇ with respect to the field ( FIG. 15 ).
  • An offset angle ⁇ of tan ⁇ 1 (a) is equivalent to a misalignment factor of a in FIG. 6 .
  • the array comprising a network of gaps may be formed by a course of obstacles, which are not identical ( FIG. 16 ). More specifically, obstacles may have different shapes or dimensions. Because the lattice on which obstacles overlay is asymmetric with respect to the field, the field flux in each gap between obstacles is divided unequally into the subsequent gaps.
  • the obstacle course which forms the network of gaps, may not be a periodic lattice.
  • FIG. 17 shows a schematic top view of an embodiment of the invention in which each obstacle may be identical and have the same horizontal period ⁇ . However, every row of obstacles is shifted horizontally by a different amount with respect to the previous row, and the obstacle course is not a Bravais lattice [N. W. Ashcroft and N. D. Mermin, Solid State Physics (Saunders College Publishing, 1976)]. Nonetheless, field flux in the array undergoes cascades of bifurcations because the obstacle course is asymmetric with respect to the average field direction. Because the critical size is dependent on the asymmetry of the field flux division, which originated from the asymmetry of the array with respect to the field, this embodiment may be useful for separating particles in a broad range.
  • particles are loaded into the array using many microfluidic channels at the top of the array ( FIG. 18 ).
  • the many channels generate a field pattern that is generally uniform across the array.
  • Particles are injected from one or more channels connected to one or more reservoirs containing the particles, which are to be carried across the array by the field.
  • particles are unloaded from the array, for example via microfluidic channels at the end of the array ( FIG. 18 ). The particles can then be routed to the next component of the microfluidic chip for further use.
  • the device of the invention can concentrate particles larger than a critical size ( FIG. 27 ).
  • This embodiment may exploit the array's ability to move particles off the applied field direction in displacement mode. Particles are introduced on one side of the array. Particles larger than the critical size of the array (moving in displacement mode) get piled against another boundary of the array.
  • the device of the invention in this case acts as a concentrator.
  • the concentrated sample can then be routed to the next component of the microfluidic chip for further use, such as creating a sample zone for fractionation.
  • the concentrated sample can also be taken off the chip for further applications.
  • the device is micro/nano-fabricated.
  • Microfabrication techniques may be selected from those known in the art, for example, techniques conventionally used for silicon-based integrated circuit fabrication, embossing, casting, injection molding, and so on [E. W. Becker et. al., Microelectronic Engineering 4 (1986), pages 35 to 56].
  • suitable fabrication techniques include photolithography, electron beam lithography, imprint lithography, reactive ion etching, wet etch, laser ablation, embossing, casting, injection molding, and other techniques [H. Becker et. al., J. Micromech. Microeng. 8 (1998), pages 24 to 28].
  • the microfluidic device may be fabricated from materials that are compatible with the conditions present in the particular application of interest. Such conditions include, but are not limited to, pH, temperature, application of organic solvents, ionic strength, pressure, application of electric fields, surface charge, sticking properties, surface treatment, surface functionalization, bio-compatibility.
  • the materials of the device are also chosen for their optical properties, mechanical properties, and for their inertness to components of the application to be carried out in the device.
  • Such materials include, but are not limited to, glass, fused silica, silicone rubber, silicon, ceramics, and polymeric substrates, e.g., plastics, depending on the intended application.
  • FIG. 19 A microfluidic device was constructed ( FIG. 19 ).
  • the microfluidic channel is 16 mm long, 3.2 mm wide, and 10 ⁇ m deep.
  • the array filling the channel consists of a square lattice of cylindrical obstacles ( FIG. 19A ), where the center-to-center distance, ⁇ is 8 ⁇ m, and the spacing d between the obstacles 1.6 ⁇ m ( FIG. 19B ).
  • the field employed here is a pressure driven field flow.
  • the lattice is rotated by 5.7° (tan ⁇ 1 0.1) with respect to the channel ( FIG. 19A ), which defines the flow direction.
  • this configuration provides 10 slots, rather than the 3 discussed above.
  • Particles are injected from a 10 ⁇ m-wide channel and carried across the array by a pressure-driven flow, which is made uniform by the many channels on the top and bottom of the array ( FIG. 19C ).
  • the microfluidic channels and the array were fabricated on a silicon wafer using photolithography and deep reactive ion etching, techniques conventionally used for silicon-based integrated circuit fabrication. Holes through wafers for fluid access were drilled before sealing with a glass coverslip coated with silicone rubber (RTV-615 from General Electric) to sandwich the array.
  • the two transport modes were experimentally observed using fluorescent polystyrene microspheres of 0.40 ⁇ m and 1.03 ⁇ m in aqueous buffer ( FIG. 20A ) (0.1 ⁇ Tris-Borate-EDTA buffer containing 0.02% POP-6, a performance-optimized linear polyacrylamide (Perkin-Elmer Biosystems), was used in the experiments.).
  • the image was taken by fluorescent microscopy with a long exposure time to show trajectories of individual particles.
  • the varying brightness along the trajectory reflects the different flow speeds of a microsphere in the array, dimmer in the narrow gaps due to higher flow speed and lower residence time.
  • the 0.40 ⁇ m microsphere (left) crossed a column of obstacles every 10 rows in the zigzag mode, whereas the 1.03 ⁇ m microsphere (right) was channeled along the axis of the obstacle array in the displacement mode.
  • FIG. 20B shows the continuous-flow separation of 0.40 ⁇ m and 1.03 ⁇ m microspheres injected into the array from a feed channel at the top.
  • the 0.40 ⁇ m and 1.03 ⁇ m spheres migrated at ⁇ 0° (flow direction) and ⁇ 5.7° (array rotation) respectively relative to the flow direction, as expected.
  • the pressure used to drive the flow was 30 kPa, which created an average flow speed of ⁇ 400 ⁇ m/s.
  • the running time through the device was ⁇ 40 s.
  • fluorescent microspheres of 0.60 ⁇ m, 0.70 ⁇ m, 0.80 ⁇ m, 0.90 ⁇ m and 1.03 ⁇ m diameter were mixed and injected into the array (The concentrations of the microspheres of 0.60 ⁇ m, 0.70 ⁇ m, 0.80 ⁇ m, 0.90 ⁇ m and 1.03 ⁇ m were 0.015%, 0.010%, 0.010%, 0.005% and 0.005% solid, respectively).
  • the beads were separated into different streams using a flow speed of ⁇ 40 ⁇ m/s, created by a driving pressure of 3 kPa.
  • the fluorescence profile scanned 11 mm from the injection point is shown in FIG. 21 .
  • the measured migration directions with respect to the flow are plotted as a function of the microsphere size in FIG. 22 , which shows that under this flow speed ( ⁇ 40 ⁇ m/s), the transition from the zigzag to the displacement mode is gradual. The smooth transition is probably due to Brownian motion of the particles between streamlines.
  • a flow speed of 40 ⁇ m/s a 0.6 ⁇ m particle—diffusion coefficient in water of 0.73 ⁇ m 2 /s (H. C. Berg, Random Walks in Biology , Princeton University Press, New Jersey, 1993, p. 56)—has a diffusion length of ⁇ 0.54 ⁇ m over the 0.2 s it takes to move the 8 ⁇ m from one row of obstacles to the next. This is a factor of 3 larger than the average slot width of ⁇ 0.16 ⁇ m.
  • Peclet number is defined as
  • FIG. 22 shows a sharper transition when the flow speed is increased by a factor of 10 ( ⁇ 400 ⁇ m/s), created by a driving pressure of 30 kPa.
  • the high flow speed not only increases the selectivity so that the device becomes more sensitive to size changes, but also shortens the running time to ⁇ 40 s.
  • the transition occurs approximately at 0.8 ⁇ m ( FIG. 22 ).
  • the size coefficients of variation (CV) of the best monodispersed microspheres commercially available are 1.3%, 1.0% and 1.0% for 0.70 ⁇ m, 0.80 ⁇ m and 0.90 ⁇ m, respectively, as measured by the manufacturer.
  • the coefficient of variation (CV) of particle diameter ⁇ is defined as
  • CV ⁇ ⁇ ⁇ ⁇ ⁇ > ⁇ 100 ⁇ % , where ⁇ is the standard deviation of ⁇ , and ⁇ > the mean of ⁇ .
  • CV's are calculated according to:
  • the array can be designed to have varying gap widths as a function of distance, thereby optimizing separation for complex mixtures.
  • a device was fabricated containing 9 sections, each of which had a different gap width, starting with 1.4 ⁇ m and ending with 2.2 ⁇ m in increments of 0.1 ⁇ m ( FIGS. 23 and 24 ).
  • the varying gap widths were designed to tune the critical diameter in 9 stages from ⁇ 0.70 ⁇ m to ⁇ 1.10 ⁇ m, so that a given sized particle would switch from displacement mode to zigzag mode as the gap width increased.
  • the fluorescent intensity profile was scanned at ⁇ 14 mm from the injection point ( FIG. 25 ), and showed that the 0.80 ⁇ m, 0.90 ⁇ m and 1.03 ⁇ m peaks had CV's of 1.1%, 1.2% and 1.9%, respectively (see the scale bars, centered at the means of the peaks).
  • the 1% CV attributable to nonuniformity in the microsphere population is shown as the black scale bars underneath the peaks. Note that a fraction of the 1.03 ⁇ m microspheres were separated out from the main peak and formed a sub-band, most likely because of the non-homogeneity in the microsphere population. Again, the peaks are virtually resolved to the mono-dispersity of the most uniform microspheres commercially available.
  • the running time was ⁇ 40 s.
  • FIGS. 21 and 25 suggest that the resolution of the device may exceed our ability to measure it.
  • Example 1 A device having identical array dimensions and loading structures as in Example 1 was constructed for separation of nucleic acids according to molecular weight.
  • the device was made of fused silica instead of silicon using the same techniques as described in Example 1. Electric fields, instead of pressure-driven fluid flow, was used as the field.
  • a mixture of coliphage ⁇ and T2 dsDNA (48.5 kb and 164 kb respectively) at ⁇ 2 ⁇ g/ml and ⁇ 1 ⁇ g/ml was used as a test sample, and visualized by fluorescent microscopy. DNA was stained with TOTO-1 (Molecular Probes) at a ratio of 1 dye molecule per 10 base pairs.
  • TOTO-1 Molecular Probes
  • POP-6 a performance-optimized linear polyacrylamide (Perkin-Elmer Biosystems), and 10 mM dithiothreitol (DTT) were added to the 1 ⁇ 2 ⁇ Tris-Borate-EDTA buffer to suppress electro-osmotic flow and photo-bleaching, respectively.
  • the electric fields were applied using electrodes immersed in buffer reservoirs.
  • the migration speeds of the molecules were controlled by the voltage applied to the reservoirs, and measured by observing the velocity of individual molecules.
  • the two species were separated with good resolution using an electric field of ⁇ 5 V/cm ( FIG. 26 ).
  • a device of the present intervention for concentrating DNA molecules is made and schematically shown in FIG. 28 .
  • the device comprises an array and microfluidic channels for sample injection and extraction, which are identical in dimensions with Example 1.
  • the field used herein is an electric field, applied using electrodes immersed in the buffer fluid reservoirs.
  • the device is made of fused silica using techniques described in Example 1. Coliphage T2 DNA at ⁇ 1 ⁇ g/ml in 1 ⁇ 2 ⁇ Tris-Borate-EDTA buffer containing 0. 1% POP-6, a performance-optimized linear polyacrylamide (Perkin-Elmer Biosystems) and 10 mM dithiothreitol (DTT), was used as a test sample.
  • the DNA was loaded onto the device at the sample reservoir, and concentrated against a boundary of the array to ⁇ 120 ⁇ g/ml ( FIG. 29 ).
  • the electric field strength was ⁇ 5 V/cm.
  • the concentrated sample is removed from the array and collected in the sample-collection reservoir ( FIG. 28 ).

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